Fearson's GPS - Guaranteed Positioning System

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You instruct the spectator to stand still with arms extended.

They hold out their fists and you extend yours in a similar manner, mirroring their actions.

You IMMEDIATELY know which hand holds the bill.

Although there is no way you could possibly know which hand holds each item you are able to correctly identify which hand holds the bill not just once, but over and over. You never miss. You are ALWAYS right. This is Steve Fearson's GPS, the Guaranteed Positioning System.

Hands are clearly shown empty throughout the performance!
Nothing up your sleeves, you can do this in a bathing suit!
No guesswork involved. You NAIL it each and every time!

This can be presented as a simple bar bet or built up with repetition into the most incredible feat of mentalism your audience has ever seen.